在测试Elasticsearch聚合的时候报了一个错误。具体如下：
GET /megacorp/employee/_search
{
"aggs": {
"all_interests": {
"terms": { "field": "interests" }
}
}
}报错信息：
{
"error": {
"root_cause": [
{
"type": "illegal_argument_exception",
"reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [interests] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
}
],
"type": "search_phase_execution_exception",
"reason": "all shards failed",
"phase": "query",
"grouped": true,
"failed_shards": [
{
"shard": 0,
"index": "megacorp",
"node": "wlvuJ0f_SsCxys6ZW5j7eA",
"reason": {
"type": "illegal_argument_exception",
"reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [interests] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead."
}
}
]
},
"status": 400
}解决方案：
1、ElasticSearch5.x的解决方法是这样开启fielddata的：
PUT /megacorp/_mapping/employee
{
"properties": {
"interests": {
"type": "text",
"fielddata": true
}
}
}2、版本为ElasticSearch6.x或者7.x时开启fielddata的：
PUT /megacorp/_mapping
{
"properties": {
"interests": {
"type": "text",
"fielddata": true
}
}
}转载来自：《Elasticsearch聚合问题》
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